Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 96d989b84a7ebb4e288442cf888af3357f961046
  - Service instance topology front-end development
    
    Change-Id: Ie39ede5583468def6ddfdbf6aa15b44aca61b982
    Issue-ID: USECASEUI-224
    Signed-off-by: guochuyicmri <guochuyi@chinamobile.com>
    
1 file changed